linux-kernel - [PATCH -v3.1 2/3] x86: Add a BSP cpuinit helper

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Date:	Fri,  5 Aug 2011 15:15:09 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Avi Kivity <avi@...hat.com>,
	Andre Przywara <Andre.Przywara@....com>,
	Martin Pohlack <Martin.Pohlack@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: [PATCH -v3.1 2/3] x86: Add a BSP cpuinit helper

From: Borislav Petkov <borislav.petkov@....com>

Add a function ptr to struct x86_cpuinit_ops which is destined to be run
only once on the BSP during boot.

Signed-off-by: Borislav Petkov <borislav.petkov@....com>
---
 arch/x86/include/asm/x86_init.h |    1 +
 arch/x86/kernel/cpu/common.c    |    2 ++
 arch/x86/kernel/x86_init.c      |    1 +
 3 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index d3d8590..08994a0 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -147,6 +147,7 @@ struct x86_init_ops {
  */
 struct x86_cpuinit_ops {
 	void (*setup_percpu_clockev)(void);
+	void (*run_on_bsp)(void);
 };
 
 /**
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 22a073d..465e633 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -681,6 +681,8 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 	filter_cpuid_features(c, false);
 
 	setup_smep(c);
+
+	x86_cpuinit.run_on_bsp();
 }
 
 void __init early_cpu_init(void)
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 6f164bd..76b37ed 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -90,6 +90,7 @@ struct x86_init_ops x86_init __initdata = {
 
 struct x86_cpuinit_ops x86_cpuinit __cpuinitdata = {
 	.setup_percpu_clockev		= setup_secondary_APIC_clock,
+	.run_on_bsp			= x86_init_noop,
 };
 
 static void default_nmi_init(void) { };
-- 
1.7.4.rc2

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